<template>
  <div>
    <div class="search">
      <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音">
    </div>
  <div
    class="search-content"
    ref="search"
    v-show="keyword"
  >
    <ul>
      <li
        class="search-item border-bottom"
        v-for="item of list"
        :key="item.id"
        @click="handleCityClick(item.name)"
      >
        {{item.name}}
      </li>
      <li class="search-item border-bottom" v-show="hasNoData">
        没有找到匹配数据
      </li>
    </ul>
  </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapMutations} from 'vuex'
export default {
  name: 'CitySearch',
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    // 意思是有一个mutation叫changeCity，映射到了一个叫changeCity的方法里
    ...mapMutations(['changeCity'])
  },
  props: {
    cities: Object
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: {
    keyword () {
      if (this.timer) {
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) {
          this.cities[i].forEach((value) => {
            if (value.spell.indexOf(this.keyword) > -1 ||
                 value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  },
  // 数据发生变化，页面实时更新
  updated () {
    this.scroll.refresh()
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.search)
  }
}
</script>

<style lang="stylus" scoped>
  @import "~styles/varibles.styl"
  .search
     height :.72rem
     padding :0 .1rem
     background : $bgColor
     text-align :center
    .search-input
        box-sizing :border-box
        width :100%
        height :.62rem
        padding :0 .1rem
        line-height :.62rem
        text-align :center
        border-radius :.06rem
        color :#666
    .search-content
        z-index: 1
        overflow :hidden
        position :absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom :0
      .search-item
         line-height :.62rem
         background :#fff
         color : #666
</style>
